Pseudointegricorpus clarireticulatum (Samoilovitch) Takahashi: morphology and ultrastructure |
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| Authors: | Maria Tekleva Valentina Markevich Eugenia Bugdaeva Ge Sun Olga Gavrilova |
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| Institution: | 1. Borissiak Paleontological Institute, Russian Academy of Sciences, Moscow, Russiatekleva@mail.ru;3. Institute of Biology and Soil Science, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia;4. Key-Lab for Evolution of Past Life, MOEC, Jilin University, Changchun, P.R. China;5. College of Paleontology, Shenyang Normal University, Shenyang, P.R. China;6. Komarov Botanical Institute, Russian Academy of Sciences, Saint-Petersburg, Russia |
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| Abstract: | Dispersed tricolpate pollen of Pseudointegricorpus clarireticulatum (Samoil.) Takah. from the Upper Maastrichtian in Zeya-Bureya Basin, Amur (Heilongjiang) River area, Russian Far East/China has been studied with light and electron microscopy. Pollen size, pole outlines and the shape of equatorial projections show some variation within the species. The exine is striate-reticulate, semitectate and columellate. The species is characterised by highly complex structures that have harmomegathic function and include equatorial projections, endexinous thickenings, difference in the thickness of the infratectum, foot layer and endexine throughout the pollen grain, and equatorial furrows. Exine layers taper towards colpi regions while they break abruptly in furrow regions. The furrows could have helped to shed the exine quickly and enabled pollen germination. A non-extended region with a small cavity in the ectexine was observed in the equatorial region. We think that this region is characteristic of most Triprojectate species. |
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| Keywords: | Triprojectates ultrastructure harmomegathy pollen |
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